root@lubuntu:/# echo "Australia/Adelaide" | sudo tee /etc/timezone
Australia/Adelaide
root@lubuntu:/# sudo dpkg-reconfigure --frontend noninteractive tzdata

Current default time zone: 'Etc/UTC'
Local time is now:      Tue May 24 05:43:58 UTC 2016.
Universal Time is now:  Tue May 24 05:43:58 UTC 2016.